DC2202A - Schematic

5
4
3
2
1
SHOULD BE PLACED BETWEEN VIN1 AND GND1. C12
** C2
SHOULD BE PLACED BETWEEN VIN2 AND GND2. THESE
CAPACITORS MUST BE PLACED AS CLOSE AS POSSIBLE TO
LT8640.
EN/UV
SYNC
E1
R1
100K
E2
C11
10uF
50V
1206
22uF
63V
R6
OPT
SUNCON
63CE22BS
**
13
C12
1uF
50V
**
14
E6
17
JP1
E5
SYNC
BURST
C
SPREAD-SPECTRUM
PULSE-SKIPPING
GND
+ C1
C2
1uF
50V
1
2
3
4
5
6
7
8
2
16
C7
1uF
25V
15
R2
18.2K
(2MHz)
E9
TR/SS
E7
C8
0.1uF
VIN2
BST
3
L1
C4
1.5uH
0.1uF
16V 74437346015
8
SW 9
SW 21
SW 22
SW
EN/UV
SYNC
BIAS
RT
PG
FB
C6
100uF
10V
1210
R7
1
0
E4
R3
19
R4
20
R5
243k
C5
C9
1uF
E3
C13
4.7uF
VOUT
5V / 5A
*
GND
C
100k
1Meg
10pF
PG
L2
0
B
VIN
VEMI
E10
C14
0.1uF
50V
0402
C3
10uF
50V
1210
C10
10uF
50V
1210
2010
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
TECHNOLOGY
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
TITLE: SCHEMATIC
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
NOTES: UNLESS OTHERWISE SPECIFIED
A
SEE DEMO MANUAL
VOUT
INTVCC
TR/SS
*
E8
FB1
74279226101
B
D
VIN1
GND
GND
4
VIN
18
VIN
5.7V - 42V
6
7 GND1
10 GND1
11 GND2
GND2
D
U1
LT8640EUDC
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
N/A
DATE:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
A
42V, 5A MICROPOWER SYNCHRONOUS
STEP-DOWN SILENT SWITCHER
IC NO.
REV.
LT8640EUDC
3
DEMO CIRCUIT 2202A
Thursday, November 20, 2014
2
SHEET
1
1
OF
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